// Emacs style mode select	 -*- C++ -*-
//-----------------------------------------------------------------------------
//
// $Id:$
//
// Copyright (C) 1993-1996 by id Software, Inc.
//
// This source is available for distribution and/or modification
// only under the terms of the DOOM Source Code License as
// published by id Software. All rights reserved.
//
// The source is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
// for more details.
//
// DESCRIPTION:
//		System specific interface stuff.
//
//-----------------------------------------------------------------------------


#ifndef __R_MAIN__
#define __R_MAIN__

#include "d_player.h"
#include "r_data.h"


#ifdef __GNUG__
#pragma interface
#endif


//
// POV related.
//
extern fixed_t			viewcos;
extern fixed_t			viewsin;

extern int				viewwidth;
extern int				viewheight;
extern int				viewwindowx;
extern int				viewwindowy;



extern int				centerx;
extern int				centery;

extern fixed_t			centerxfrac;
extern fixed_t			centeryfrac;
extern fixed_t			projection;

extern int				validcount;

extern int				linecount;
extern int				loopcount;


//
// Lighting LUT.
// Used for z-depth cuing per column/row,
//	and other lighting effects (sector ambient, flash).
//

// Lighting constants.
// Now why not 32 levels here?
#define LIGHTLEVELS				16
#define LIGHTSEGSHIFT			 4

#define MAXLIGHTSCALE			48
#define LIGHTSCALESHIFT			12
#define MAXLIGHTZ			   128
#define LIGHTZSHIFT				20

extern lighttable_t*	scalelight[LIGHTLEVELS][MAXLIGHTSCALE];
extern lighttable_t*	scalelightfixed[MAXLIGHTSCALE];
extern lighttable_t*	zlight[LIGHTLEVELS][MAXLIGHTZ];

extern int				extralight;
extern lighttable_t*	fixedcolormap;


// Number of diminishing brightness levels.
// There a 0-31, i.e. 32 LUT in the COLORMAP lump.
#define NUMCOLORMAPS			32


// Blocky/low detail mode.
//B remove this?
//	0 = high, 1 = low
extern	int				detailshift;


//
// Function pointers to switch refresh/drawing functions.
// Used to select shadow mode etc.
//
extern void				(*colfunc) (void);
extern void				(*basecolfunc) (void);
extern void				(*fuzzcolfunc) (void);
// No shadow effects on floors.
extern void				(*spanfunc) (void);


//
// Utility functions.
int
R_PointOnSide
( fixed_t		x,
  fixed_t		y,
  node_t*		node );

int
R_PointOnSegSide
( fixed_t		x,
  fixed_t		y,
  seg_t*		line );

angle_t
R_PointToAngle
( fixed_t		x,
  fixed_t		y );

angle_t
R_PointToAngle2
( fixed_t		x1,
  fixed_t		y1,
  fixed_t		x2,
  fixed_t		y2 );

fixed_t
R_PointToDist
( fixed_t		x,
  fixed_t		y );


fixed_t R_ScaleFromGlobalAngle (angle_t visangle);

subsector_t*
R_PointInSubsector
( fixed_t		x,
  fixed_t		y );

void
R_AddPointToBox
( int			x,
  int			y,
  fixed_t*		box );



//
// REFRESH - the actual rendering functions.
//

// Called by G_Drawer.
void R_RenderPlayerView (player_t *player);

// Called by startup code.
void R_Init (void);

// Called by M_Responder.
void R_SetViewSize (int blocks, int detail);

#endif
//-----------------------------------------------------------------------------
//
// $Log:$
//
//-----------------------------------------------------------------------------
